.form {
    width: 400px;
    margin: 20px auto;
    font-size: 16px;
    overflow: hidden;
}
.lable {
    display: block;
    float: left;
    font-weight: 800;
    margin-right: 20px;
    line-height: 34px;
}
.btn {
    display: block;
    float: left;
    color: #fff;
    padding: 8px 14px;
    background-color: rgb(24,116,189);
    border: none;
    font-size: 16px;
    border-radius: 8px;
    margin-left: 20px;
    outline: none;
}
#ipt {
    display: block;
    float: left;
    height: 28px;
    width: 240px;
    border: 2px solid rgb(199,199,199);
    box-shadow: 0 0 2px 0 rgb(199,199,199);
    outline: none;
    padding-left: 8px;
    padding-right: 8px;
}
#tip {
    display: inline-block;
    margin-left: 52px;
    margin-top: 8px;
}
.default {
    color: rgb(169,169,169);
}
.error,
#ipt.error {
    color: red;
    border-color: red;
}
.true,
#ipt.true {
    color: rgb(39,198,82);
    border-color: rgb(39,198,82);
}